Any of the irregularly shaped discrete particles or crystals in a rock or a metal, usually but not necessarily small: (a) in Geology; (b) in Meta…
| 单词 | θ6482 |
| 释义 | the world > the earth > minerals > mineral structure or appearance > [noun] > grain (2) grain1813 Any of the irregularly shaped discrete particles or crystals in a rock or a metal, usually but not necessarily small: (a) in Geology; (b) in Meta… chondrule1889 A small spherical grain of mineral embedded in varying numbers in the matrix of chondritic meteorites. |
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